Page History

...

1. Navigate to and open the page to which you want to add an attachment.
2. Click the ... menu in the upper-right corner of the page and select Attachments.
3. Browse to the file you want to attach and select it.
4. Click Attach.
5. Upload the file as described in the following Atlassian help page: 
   https://confluence.atlassian.com/conf613/upload-files-964960695.html

   Multiexcerpt include
   MultiExcerptName ExitDisclaimer nopanel true PageWithExcerpt wikicontent:Exit Disclaimer to Include

6. To return to the contents of the page, click View Page.

...

1. Navigate to and open the page in which you want to add a link. 
2. In the page you want to change, click Edit. 
3. Click the link icon. The Insert link dialog box appears. 
4. Select Files and select the attachment. 
5. Click Insert. A link appears, with the filename as the link text, as shown in the following example: Example_document_508_compliant.doc. 

Also refer to the following Atlassian help page:

https://confluence.atlassian.com/conf613/links-964960436.html